Color print viewable by lights of different colors and process of making the same



. c. BERGER. COLOR PRINT VIIEWABLE BY LIGHTS OF DIFFERENT COLORS AND PROCESS or MAKING THE SAME. APPLICATION FILED JAN. 20, I920.

Patented July 11, 1922.

REA?

UNITED STATES"- PATENT OFFICE.

CHRISTIAN BERGER, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO FREDERICK L.v

SAWYER, OF NEW YORK, N. Y.

COLOR PRINT VIEWABLE BY LIGHTS Specification of Letters Patent.

Patented July 11, 1922.

Application filed, January 20, 1920. Serial No. 352,735.

T 0 all whom it may concern:

Be it known that I, CHRISTIAN BERGER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Color Prints Viewable by Lights of Different Colors and the Processes of Making the Same, of whichthe following is a specification, reference being had-therein to the accompanying drawing.

This invention is a novel color print, or plural color print, viewable by lights of different or opposite colors,and the process of making the same. By a plural color print, I mean preferably a print produced in two different strong colors in its operative areas. The selected strong colors may, for example, be red and green, by the first of which I mean orange or red or anything between them in the spectrum, and by the latter-any color or mixture from blue to green; so that the two selected colors are drawn from opposite ends of the spectrum. The selected colors may be termed opposite colors, by which T mean in effect that they are substantially'complementary or distinctly different, this beingessential to the purposes of the present invention. By a print I mean any inscription, impression, chart' or the like produced in the selected colors, whether by hand or by photographic or printing press or other methods, and whether the representation be a picture, a legend, a symbol or other representation. Prints of this general nature have been heretofore known and used for various purposes. By'the expression viewable by lights of opposite colors I refer to the plan of examining such prints,,'

for various purposes, by looking separately through, for example, a red screen or glass and through a green screen, or equivalently examining the same by illuminating them by throwing light-s of these colors separately on the print; or other colors, as may be selected.

Various uses or embodiments: of a plural color print of the nature referred to are possible, and three of such uses will be indicated in the drawings hereof, as follows. First, the simultaneous viewing of two oppositely colored superimposed, lmages for stereoscopic purposes, such print being lmown as an anaglyph and the viewing apparatus an anagylphoscope. Second, the viewing in alternation or rotation of two images,'to di play them successively, these, for example, being correlated images for the purpose of giving the effect of motion. Third, these- .lective examination or viewing of a print or chart, so. that according to the screen or illumination used, one orv the other of the oppositely colored images will be rendered ap-' parent. An embodiment of the last mentionedis shown in the two colorchart of the measur1ng or weighing apparatus of my .ploy special printing colors so selected as to give perfection of result. When the print is viewed by the green light, the green image is supposed to disappear by blending with the background, now colored by the green light to approximately the same shade; and vice versa with the red. With a theoretically perfect apparatus and print, the viewing through the green glasswould show up distinctly in black the print portion which is colored red, with complete elimination of the green portion of the print. Such perfection,

however, is not practicable, and the consequence is that a decided trace is apparent of the image or portion of the print which is supposedto disappear,that is, the portion of the picture printed in what I may term the idle color. The presence of this trace or ghost of the idle color objectionably interferes in many cases with the proper perception and effect of the image of the active or DIFFERENT ooLoRs Am) rRocEss or MAKING I THE SAME.

color, which, although predominant, is accompanied by the ghost of the image which should have disappeared.

' The main purpose of the present invention is to eliminate the defect referred to. The general plan of the invention is to treat the surface of the paperor support, surrounding or contiguous to the image, with athin or pale coloring, which I may term a tint, 111 such a manner that where the ghost of the to render one imageapparent and the other substantially invisible to each eye.

Fig. 3 is a two color print in which the oppositely colored parts are intended to be viewed in alternation, for example,'so as to give the effect of motion.

print.

Fig. 4 represents an apparatus by which the print of Fig. 3 may be viewed, first through green glass and then through red .glass, or by which illumination of such colors can be alternately thrown upon the Fig. 5 a print having two inscriptions, symbols or letters printed in the two colors such that one or the other may be selectively rendered predominantly apparent.

Fig. 6 represents a glass of one of the opposite colors for effecting elimination of one of the colored letters, and Fig. 7 is an oppositely colored glass for eliminating the other letter and rendering the first apparent.

. Fig. 8 is a chart showing the system of designating the colors in the other figures.

Referring first to the embodiment of Figs.

' 1 and 2, the print comprises a picture designated 10 as a whole, and comprisin a green portion 11 and a red portion 12. hese, for example, may represent an upright wire nail, the two positions being dueto the different angles at which the object will be seen by the two eyes. Such a picture is known as an anaglyph. This may be viewed by a simple pair of eyeglasses comprising a reen glass 13 and a redglass '14. By ap yin this in the, relative position shown, t e le t eye looking through the green glass,.will see only the right or redimage 12, which will appear black, since the red rays are incapable of passing through the green glass. At the same time the green image 11 should appears in black. The result-is that thetheoretically disappear. [The right eye, looking through the red glass 14, similarly sees only the left or green image 11, which images combine, giving the appearance of,an upright wire nail standing vertically out of the support or paper onwhich the image is printed. Where the red and green images overlap, namely, at the area 15, the printing may be in black, as this area is to appear black to each eye.

TL Now, f the green glass and coloring are not perfectlyin accordance with the theory,

gthereon would tend simply to degrade the images 11 and 12 without benefit. The tint 16 is applied superficially on the white paper surrounding the colored, and the exact character of the tint may be varied in accordance with the requirements. I

For example, the proper tint may be determined as follows. When viewing the picture through the green glass 13, a ghost of the green image 11 appears. By applying a ver pale redtint to the "surrounding area, this is readily brought to a darkness to match the ghost of the image 11, and when matched the ghostdisappears. If the right eye similarlysee the ghost of the red image 12,- a slight amount of green tint will similarly eliminate that. It is there fore only necessary toapply a mixtureof pale aniline or similar dyes with the correct depth of pale green and the correct depth of pale red, so that the background will be colored somewhat with each, and thus eliminate the ghosts of both images. When the requirements are once determined for any given colors of glasses and images, the desired mixture or tint is readily determined and can be applied by printing or other- Wise overthearea surrounding'the colored images. The tint will only be a tinge, scarcely apparent andunobjectionable, and the result is to eliminate the false images, and give the results with only imperceptible sacrifice in the resulting final image. Instead of a mixture of pale red and green colors, other tints are equally applicable. For example, a pale yellow being unable to pass in toto through either the red glass or the green glass, 'will tint the background as viewed through both, and thus eliminate both ghosts. Obviously, if a ghost should appear only in case of'one of the images, no tinting of that color would be necessary, but only of the opposite color. In some cases a purely neutral tint. such as a gray, would serve the purpose hereof. When this invention is properly applied to a stereoscopic subject, conventionally represented by Fig. 1, very pleasing and true is shown as having general portions in neither green nor red, but in black or any.

' motion, namely, two persons shaking hands.

The tinted area 26 surrounding the colored areas 21 and 22 wholly eliminates false images and gives a far more perfect effect.

- 7 In Fig. 5, as in my prior Patent 1,245,842,

the letter Ur is rendered predominant.

' red ink.

'latter red and tinted white.

before referred to, are shown two superposed symbols or characters, namely, the

letter G in green, and the letter R in red. \Vhen seen throughthe Fig. 6 green glass,

. the letter G is rendered predominant. .Where when seen'through the red glass, of Fi 7, ere the red andgreenportion's overlap at 35 the print may be in either black, or in the overlapping colors. Surrounding these color portions is the tinted area 36 applied according to this invention, with the result that, when vlewing the G image 31 through 'the red glass 34, for example, there will be no ghost or false image of the R image 32, and vice versa. r

The plural colored print hereof may be produced in various ways. One simple and effective mode is to print the green portions 11,21 or 31 with a'greas'y green ink, then the red portions 12, 22 or 32 with agreasy Other or black portions can be printed before or after these. Finally. the entire picture ,can be dipped or spread rapidly with the proper selected tint. This will be repelled by the greasy ink of the portions 11, 12, 21, 22, 31 and 32, and will slightly color to the desired extent the surrounding portions 16.

Partial embodiments may in certain situa tions be used, employing this invention. For example, the print may omit one of the spectrum colors and consist for example of black portionS-andred portions on a tinted white ground. When viewed by red light the red portions disappear, when viewed by green or white or other light, everything appears. Forexample, the curved parts of the letter B might be in red, the rest in black, so that, when seen through a red glass,

wholly disappear when viewed by 'red light,

and reappear with white, green or other l1ght.- Each of the prints in such cases is a plural color print in a sense, the former] being red, black and tinted. white, the

Another partlal embodiment would be, fora redand green picture for example, to utilize the invention to eliminate the ghost of onefsay.

the red portion, but not the other, thus leaving a trace or shadow of the green portion when viewed througha green glass, for any effect or use that may be desired.

It will thus be seen that I have described a plural color print viewable by light of opposite colors, anda process of making the same, embodying the principles and attaining the objects and advantages of the present invention. Since many matters of arrangement, design and detail-may be variously modified without departing from the which completely neutralizes any contrast with either diminished print, whereby view ing by light of either color discloses the print of the opposite color without trace of the print of the first color.

2. An anaglyph, or stereoscopic print viewable. through color filters of opposite colors, the same consisting of superposed stereoscopic images of the two opposite colors, such that when viewed by light of either color the appearance of the image of that color is substantially diminished, the superposed images being of water repel-- lant ink, and, the surrounding field being tinted with a water soluble color which completely neutralizes any contrast with either diminished image, whereby viewing the print through screens of the two colors for the respective eyes gives stereoscopic effect without interfering traces of the diminished images. i

3. The method of manufacturing articles of the kinds described, consisting in printing the two'component prints in water. re-

pelling inks of the opposite colors upon a substantially white carrier and then washing'the surface of the carrier with a Water soluble color or dye of the neutralizing tint.

4. The method consisting in printing su- .perposed prints by greasy commercial inks of opposite colors, and subsequently applying a contrast neutralizingtint'by a water color-or dye, whereby the surface which is not printed in said inks is tinted to the desired color, while the surface bearing the inks is preserved untinted. 7

-5. A print viewable by lights of opposite colors such as red and green, for example by viewing it through color filters of said 90 witha water soluble oolor or dye of a color CO1OI'S,'S31id print consistin of a support bearing superposedprints 0 the two opposite colors, such that when viewed by li ht of either color the appearance of the print of that color .is substantially diminished, the surrounding field, but not the support beneath the printed colors, being tinted of a color which completely neutralizes any contrast with either diminished print, whereby viewing by light of either color discloses discloses the print of the opposite color the print of the opposite color without trace of the print of the first color.

6. A print viewable by lights of opposite colors, such as red and green, for example by viewin it through color filters of said colors, sai print consisting of a white sup is substantially diminished, the surrounding field,but not the support beneath the printed colors, being tinted with a water soluble color which completely neutralizes any contrast with either diminished print, whereby viewing by light of either color without trace of the print of the first color. In testimony whereof, I have afiixed my signature hereto.

CHRISTIAN BERGER. 

